Electron velocity distribution function measurement in microwave cathode plume by incoherent laser Thomson scattering
ORAL
Abstract
In this work, we conducted an incoherent laser Thomson scattering (incoherent LTS) to measure the electron velocity distribution function at the plume region of a microwave cathode. The result obtained from incoherent LTS shows the electron density of 10^18 m^-3 and the electron temperature of 2-4 eV, which is validated by the comparison with a Langmuir probe measurement. Additionally, the incoherent LTS shows the EVDF is non-Maxwellian EVDF at a low propellant flow rate, whereas Maxwellian EVDF at a high propellant flow rate, indicating that the electron heating and cooling mechanism depends on the propellant flow rate.
*The authors express our gratitude to Prof. Sedina Tsikata for technical advice and to the Advanced Machining Technology Group of ISAS/JAXA for assistance making experimental equipment. This work was financially supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI under Grant Numbers JP17H04973 and JP20J11456.
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Publication: T. Koiso, Y. Yamashita, R. Tsukizaki, K. Nishiyama, "Measurements of Electron Velocity Distribution Function in Microwave Cathode Plume by Incoherent Laser Thomson Scattering", Vacuum, under review
Presenters
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Takuya Koiso
- The University of Tokyo